Caption: Homoeopathic VEGA test. Homoeopath performs a VEGA test (vegetative reflex test) on a patient's hand to diagnose allergies. The device measures the concentration of compounds within the body, which are measured against standards. A reading indicating an excess of any compound in the body is used to indicate the nature of the patient's ailment so that a homoeopathic remedy can then be prescribed. Homoeopathy is a method of treating conditions with the administration of minute doses of substances that cause the symptoms of the illness in healthy people.